#include <iostream>
#include <string>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "Comm.hpp"

using namespace std;

void Usage(const std::string &process)
{
    std::cout << "Usage: " << process << " server_ip server_port" << std::endl;
}

// ./tcp_client serverip serverport
int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        Usage(argv[0]);
        return 1;
    }
    std::string serverip = argv[1];
    uint16_t serverport = stoi(argv[2]);

    // 1. 创建socket
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
    {
        cerr << "socket error" << endl;
        return 1;
    }

    // 2.必须要有Ip和Port, 需要bind，但是不需要用户显示的bind，client系统随机端口
    // 发起连接的时候，client会被OS自动进行本地绑定
    // 2. connect
    struct sockaddr_in server;
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport);
    // p:process(进程), n(网络) -- 不太准确，但是好记忆
    inet_pton(AF_INET, serverip.c_str(), &server.sin_addr); // 1. 字符串ip->4字节IP 2. 网络序列

    int n = connect(sockfd, CONV(&server), sizeof(server)); // 自动进行bind哦！
    if (n < 0)
    {
        cerr << "connect error" << endl;
        return 2;
    }

    // 并没有向server一样，产生新的sockfd.未来我们就用connect成功的sockfd进行通信即可.
    while (true)
    {
        string inbuffer;
        cout << "Please Enter# ";
        getline(cin, inbuffer);

        ssize_t n = write(sockfd, inbuffer.c_str(), inbuffer.size());
        if (n > 0)
        {
            char buffer[1024];
            ssize_t m = read(sockfd, buffer, sizeof(buffer) - 1);
            if (m > 0)
            {
                buffer[m] = 0;
                cout << "get a echo messsge -> " << buffer << endl;
            }
            else if (m == 0 || m < 0)
            {
                break;
            }
        }
        else
        {
            break;
        }
    }

    close(sockfd);
    return 0;
}